According to RFC4646 (http://www.ietf.org/rfc/rfc4646.txt)
language codes for Traditional Chinese should be
react-native-i18n
language codes for Traditional Chinese should be
zh-Hant
react-native-i18n
import { getLanguages } from 'react-native-i18n'
getLanguages().then(languages => {
console.log(languages);
});